How to Convert Inches to Centimeters

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[bagusyogapg]

Here's my trick.

For quick rough estimate, simply mutiply inches by 5/2. But, if you want to get it more precise just add 4% of the inches to that result.

So let's say, we want to convert 42 inches to cm.

rough estimate :
42 x 5/2
= 210/2
= 105

precise conversion :
(42 x 5/2) + (42 x 4/100)
= (210/2) + (168/100)
= 105 + 1.68
= 106.8